{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{ccccc}}
\hline\hline
                    &           N&        mean&          sd&         min&         max&           N&        mean&          sd&         min&         max&           N&        mean&          sd&         min&         max&           N&        mean&          sd&         min&         max\\
\hline
\hline
Observations        &        1042&            &            &            &            &          46&            &            &            &            &          72&            &            &            &            &         108&            &            &            &            \\
\hline\hline
\end{tabular}
}
